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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba7e7db465d0eeccdc58b8f103d82918162c39a827671a2a5f17e01c191134b' 
  AND token = 'm8aMNBJwHKaXQ3IfkW9YNN6Zp24af3heRY1RRk/wKB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}